A Simplified Subdomain Analytical Model for the Design and Analysis of a Tubular Linear Permanent Magnet Oscillation Generator

Guo, Rong; Yu, Haitao; Xia, Tao; Zhong, Wenxing; Liu, Xiaomei

doi:10.1109/access.2018.2859021

Cited by 19 publications

(8 citation statements)

References 40 publications

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“…Moreover, the analytical model based on the subdomain method can be used to get more accurate predictions of the magnetic field distribution. The analytical model based on the subdomain method has already been used in various PM-based devices [73]. To predict the accurate air gap field distribution of the linear PM generator, the improved conformal mapping (ICM) method and slotless analytical model could be used as well, which have been used in various PM-based generators.…”

Section: Reduction Of Detent Force (Cogging Force and End Effect Force)mentioning

confidence: 99%

A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems

2022

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The traditional wave energy converters (WECs) use hydraulic or turbine-type power take-off (PTO) mechanisms which consist of many moving parts, creating mechanical complexity and increasing the installation and maintenance costs. Linear generator-based direct-drive WECs could be a solution to overcome this problem, but the efficiency of the single conventional linear generator is not high enough, and it cannot work satisfactorily in the low-frequency range. This article reviews the recent research developments of the linear permanent magnet (PM) generator-based WEC to harness maximum energy from ocean waves. It starts with a brief introduction and background of wave energy converters using linear generators. Following this, the working principle of the WECs with linear PM generators is briefly outlined. Subsequently, the analytical model of the linear PM generator-based WEC is studied. After that, the up-to-date developments of the linear PM generator-based PTO systems are studied. Despite some modifications resulting in complexity in the linear PM generator’s structure and a rise in manufacturing costs, the study shows the systems’ efficiencies increased by increasing magnetic flux and reducing cogging force. The key parameters and improvement issues that can increase the performances and efficiencies of the PTO systems are identified to help future researchers for further development. Moreover, the review discusses the numerical and experimental analysis tools, the typical control systems used by the researchers and the challenges of the linear generator-based wave energy conversion system. Finally, conclusions about the significant beneficial characteristics and design choice of the WEC linear generator structure are provided and related to the application conditions.

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Section: Reduction Of Detent Force (Cogging Force and End Effect Force)mentioning

confidence: 99%

A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems

2022

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“…The permanent magnet of the moving-magnet linear generator can be passively cooled as a mover, and the stator part can be forcedly cooled by water-cooling or oil-cooling. Since permanent magnets are the main failure form of permanent magnet linear generators due to high temperature demagnetization, it is necessary to study the temperature rise of the moving-magnet of the PMMLG [27], [28].…”

Section: Thermal Analysis Of the Pmmlgmentioning

confidence: 99%

A Plate Moving-Magnet Linear Generator Designed for Free-Piston Engines

Sun

Liu

2020

IEEE Access

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Free-piston engine coupled with linear generator is a research hotspot in the field of novel vehicle mounted power generation devices. A plate moving-magnet linear generator (PMMLG) is proposed and designed for free-piston engines in this paper. Magnetic circuit of the novel linear generator is analyzed and modeled in detail. The dimensions of a 2 kW prototype with the max stroke of 40 mm and the max electromagnetic force of 800 N is designed by using the derived magnetic circuit model. Static and transient electromagnetic field finite element models with motion solvers are created. Magnetic field distribution, electromagnetic force characteristics, EMF characteristics, coil inductance, generating power and losses of the linear generator are analyzed and compared with two reported prototypes. Computational fluid dynamics model of the PMMLG is established, and the temperature field is analyzed to verify that the air-cooling conditions can ensure long-term stable running of the linear generator without demagnetization. The research results show that the linear generator has the characteristics of low moving mass, low cogging force, high generating efficiency and high response speed. INDEX TERMS Linear generator, electromagnetic analysis, thermal analysis, free-piston.

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“…The subdomain model can take into account the slot opening, stator slot shape and permanent magnets, and the magnetic field prediction results have good accuracy. The method has been widely applied to the magnetic field analysis of PMSM (Teymoori et al , 2016; Tiang et al , 2015), flux-switching machines (Boughrara et al , 2013), vernier machine (Yang et al , 2018), linear machine (Guo et al , 2018; Shin et al , 2017) and dual-stator machines (Wu et al , 2019). In addition, the subdomain model is also used for the prediction of flux linkage, back electromotive force (EMF) and torque of dual-rotor machine, and the correctness of subdomain model is verified by comparing with FEM (Golovanov and Gerada, 2019).…”

Section: Introductionmentioning

confidence: 99%

An analytical model for stator yokeless radial flux dual rotor permanent magnet synchronous machine

Yang

Zhong

Wang

et al. 2022

COMPEL

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Purpose The purpose of this study is to propose an analytical model with consideration of the permeability of soft-magnetic materials, which can predict the magnetic field distribution more accurately and facilitate the initial design and parameter optimization of the machine. Design/methodology/approach This paper proposes an analytical model of stator yokeless radial flux dual rotor permanent magnet synchronous machine (SYRFDR-PMSM) with the consideration of magnetic saturation of soft-magnetic material. The analytical model of SYRFDR-PMSM is divided into seven regions along the radial direction according to the different excitation source and magnetic medium, and the iron permeability in each region is considered based on the Maxwell–Fourier method and Cauchy’s product theorem. The magnetic vector potential of each region is obtained by the Laplace’s or Poisson’s equation, and the magnetic field solution is determined using the boundary conditions of adjacent regions. Findings The inner and outer air-gap flux density, flux linkage, output torque, etc., of SYRFDR-PMSM are predicted by analytical model, resulting in good agreement with that of finite element model. Additionally, the SYRFDR-PMSM prototype is manufactured and the correctness of analytical model is further verified by experiments on no-load back electromotive force and current–torque curve. Reasonable design of the slot opening width and pole arc coefficient can improve the average output torque and reduce output torque ripple. Research limitations/implications The analytical model proposed in this paper assumes that the permeability of soft-magnetic material is a fixed value. However, the actual iron’s permeability varies nonlinearly; thus, the prediction results of the analytical model will have some deviations from the actual machine. Originality/value The main contribution of this paper is to propose an accurate magnetic field analytical model of SYRFDR-PMSM. It takes into account the permeability of soft-magnetic material and slot opening, which can quickly and accurately predict the electromagnetic performance of SYRFDR-PMSM. It can provide assistance for the initial design and optimization of SYRFDR-PMSM.

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A Simplified Subdomain Analytical Model for the Design and Analysis of a Tubular Linear Permanent Magnet Oscillation Generator

Cited by 19 publications

References 40 publications

A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems

A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems

A Plate Moving-Magnet Linear Generator Designed for Free-Piston Engines

An analytical model for stator yokeless radial flux dual rotor permanent magnet synchronous machine

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